<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=848088 --> <head> <meta charset="utf-8"> <title>Test for Bug 848088</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> <script type="application/javascript"> /** Test for Bug 848088 **/ function test(loopFor, setExpandoAt) { var list = document.getElementsByTagName("audio"); delete list.length; var shouldHaveExpando = false; var realLength = list.length; for (var i = 0; i < loopFor; ++i) { if (i == setExpandoAt) { // Add an expando that shadows. Object.defineProperty(list, "length", { value: "a" }); shouldHaveExpando = true; } var hasExpando = (list.length != realLength); if (shouldHaveExpando != hasExpando) { return false; } } return true; } ok(test(200000, 100000), "Correctly detected expando on DOM list object"); </script> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=848088">Mozilla Bug 848088</a> <p id="display"></p> <div id="content" style="display: none"> </div> <pre id="test"> </pre> </body> </html>